I have Gator blades on my 2554 and I'm unimpressed. The edge doesn't last nearly as long as the stock Cub blades and they have very poor lift. Poor enough that they won't pick up the grass well enough to mow it properly where the wheels have already run over it. You get uneven cutting and a lawn full of stripes. The stock blades didn't have this problem.
I'm going back to stock blades next year. They have great lift, long lasting sharpness, and they're cheap.